It's unclear who will next represent Tomic, who has been with IMG since he was 13 - before he won the boys' titles at the 2008 Australian Open and 2009 US Open.

The agreement spawned marketing deals with the likes of Nike, Yonex, Optus and Qantas potentially worth millions of dollars.

But in the space of two years, since reaching the fourth round of the 2012 Australian Open, Tomic has slipped from a career-high world ranking of No.27 to his current standing at 124th.

That could improve next week, however, after the Queenslander booked a spot in the quarter-finals of the Claro Open in Bogota, Colombia, on Thursday morning (AEST).

Tomic beat local hope Alejandro Falla 6-1 7-6 in just 90 minutes to advance to a last-eight meeting with third seed Vasek Pospisil.

Not since January - during his run to the final of the Sydney International - has he enjoyed successive match victories or reached a tournament quarter-final.

Subsequent double hip surgery forced him off the court for two months, wreaking havoc on his season.

He showed signs of a return to form recently on grass, including an upset round-one win at Wimbledon over Czech sixth seed Tomas Berdych, and continued that on the hard courts of Bogota by winning both of his matches in straight sets.

Meanwhile, compatriot Matt Ebden was forced to withdraw from his first-round match against British qualifier James Ward in Colombia due to a wrist injury.

Fellow Australian Sam Groth earlier beat wildcard Juan Sebastian Cabal to advance to the second round, where he'll face top seed Richard Gasquet.